java.lang.IllegalStateException
 	at org.objectweb.asm.tree.analysis.BasicInterpreter.<init>(BasicInterpreter.java:66)
 	at org.parboiled.transform.RuleMethodInterpreter.<init>(RuleMethodInterpreter.java:42)
 	at org.parboiled.transform.InstructionGraphCreator.process(InstructionGraphCreator.java:41)
 	at org.parboiled.transform.ParserTransformer.runMethodTransformers(ParserTransformer.java:62)
 	at org.parboiled.transform.ParserTransformer.extendParserClass(ParserTransformer.java:45)
 	at org.parboiled.transform.ParserTransformer.transformParser(ParserTransformer.java:39)
 	at org.parboiled.Parboiled.createParser(Parboiled.java:54)
 Caused: java.lang.RuntimeException: Error creating extended parser class: null
 	at org.parboiled.Parboiled.createParser(Parboiled.java:58)
 	at org.jenkinsci.plugins.tokenmacro.Parser.process(Parser.java:80)
 	at org.jenkinsci.plugins.tokenmacro.Parser.process(Parser.java:74)
 	at org.jenkinsci.plugins.tokenmacro.TokenMacro.expand(TokenMacro.java:199)
 	at org.jenkinsci.plugins.tokenmacro.TokenMacro.expandAll(TokenMacro.java:237)
 	at org.jenkinsci.plugins.tokenmacro.TokenMacro.expandAll(TokenMacro.java:207)
 	at org.jenkinsci.plugins.buildnamesetter.Executor.evaluateMacro(Executor.java:75)
 	at org.jenkinsci.plugins.buildnamesetter.Executor.setDescription(Executor.java:50)
 	at org.jenkinsci.plugins.pipeline.BuildDescriptionStep.perform(BuildDescriptionStep.java:35)
 	at jenkins.tasks.SimpleBuildStep.perform(SimpleBuildStep.java:123)
 	at org.jenkinsci.plugins.workflow.steps.CoreStep$Execution.run(CoreStep.java:99)
 	at org.jenkinsci.plugins.workflow.steps.CoreStep$Execution.run(CoreStep.java:69)
 	at org.jenkinsci.plugins.workflow.steps.SynchronousNonBlockingStepExecution.lambda$start$0(SynchronousNonBlockingStepExecution.java:47)
 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
 	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
 	at java.lang.Thread.run(Thread.java:748)
 Finished: FAILURE

// Sets the buildDescription from the non-null params.
buildDesc = [:]

params.each { key, value ->
  if(value) {
    buildDesc[key] = value
  }
}

buildDesc['policy_gp'] = env.policyGroup

buildDescription "${buildDesc.sort()}"